Tru2Chevy

If you are planning on adding the heads/cam, then I would also suggest going with the performer RPM. You won't notice much loss in low-end power with the performer rpm over the reg. performer. Most of that 1500 rpm will be eaten up by your converter.

Power gains from cams will depend on how radical of a cam you go with, what other mods you have to complement it, and what tuning you do to compensate for it. Just a cam won't make a lot of difference on a stock motor. Once you add an intake, headers, tune the carb, and adjust the timing, then you will see much better gains.

As far as getting intakes cheap, you should go to local swap meets and look around. I got the performer that's on my car for $50, and it was very clean.

- Justin

85_305

Well, the reason I want low-end torque is simply because I want to keep myself out of trouble by going too fast. If I make the car to be a beast down-low, and nothing too terribly special up-top, then I think I will stay out of trouble better.
I have a standard though, not an auto.. so does that mean that the 1500rpm power loss wont be as bad as an auto? or are talkting about my cat? How does adjusting timing help with performance? thnx a bunch-load for your help, tru2chevy

Tru2Chevy

Ok, before we go any further with this, what do you use this car for? Is it a daily driver? Do you race? If so, do you do mostly drag racing, road racing, or autocrossing?

What is it that you want the car to be able to accomplish when you finish your upcoming mods?

- Justin

85_305

I want this car to be a daily driver.. but I will be racing. There is a weak-assed '96 Mustang owner in town that I must put to shame, as well as an '91'ish RX7 I want to take. They will be road races.
When I finish my upcoming mods, I want to be able to haul extreme *** down low, but at the same time not be a wussy up top. I am pretty much looking for EXTREME torque.

Tru2Chevy

I'll put a few combos together on Desktop Dyno for you tonight....

- Justin

85_305

Ah, sweet man! That would be awesome! Thanx Tru2chevy!

Tru2Chevy

You have a 305, right? and no other mods besides the carb in your sig?

- Justin

85_305

Well, I have this carb-adapter plate from Edelbrock..

Four-hole, Square-bore to Spread-bore Adapter (.850" thick) ....#2696
Mounts Edelbrock square-bore carbs to stock Quadrajet & Thermo-Quad manifolds.

I hope to use this on the new manifold for the added power, but am unsure if it will fit on the manifold I want. Will it fit on any manifold? Or just the stock Q-Jet manifold?

And I am getting a 3 inch exhaust; Catco hi-flo cat, 80-series, and Heddman headers. Not to mention the intake manifold we are talking about.
Further down the line, porting heads and a cam/lifters, etc.. will be done!
THan tru2chevy, your awesome!

And yes, I have a 305.

IROC-T

It is just an adapter,if you have a spread bore manifold it will allow you to install a square bore carb on it. It will not let you put a spread bore on a square bore manifold (butterflies will hit) and will not give you any in crease in power.

85_305

Oh *****.. that stinks lol
But will a Perfomer RPM with a Performer 600 fit under the stock hood of my Camaro?

Tru2Chevy

Ok, playing around with Desktop Dyno:

305, stock heads, 600cfm carb, aftermarket dual-plane manifold (either of the performers), headers, and a Comp Cams Xtreme Energy 262H-10 cam

RPM HP Torque
2000 120 316
2500 153 321
3000 186 326
3500 219 329
4000 246 322
4500 259 302
5000 255 267
5500 234 224


This combo will net you some really nice low end power, with a cam that isn't too aggressive. (.462/.469 110 LSA) The kit (cam, springs, locks, retainers, lifters) is approx. $300.

If you want to add a set of heads like the aluminum L98 'vette heads, power will be up just a touch

RPM HP Torque
2000 124 325
2500 158 332
3000 192 336
3500 227 341
4000 260 341
4500 285 333
5000 300 315
5500 300 286

These heads can be found at swap meets for about $400 (I paid $375 for mine).

- Justin

85_305

Wow.. those are totally awesome numbers! Thanx a bunch tru2chevy! Do you know off the top of your head how much power would go up if I ported my heads?
Should I go for the aluminum L98 heads over the cast-iron ones? I would think I could get them cheaper from a junkyard, no?

Tru2Chevy

That would depend on exactly what you had done to them, and how well it was done. Mine are port matched to my intake, and have a minor valve job.

I would go for the aluminum, they are a different casting, and flow better. They also save about 75lbs off the nose of your car. I'm sure they would be much cheaper in a junkyard, but how often do you see late 80's/early 90's vettes in the yards?

- Justin

85_305

When you say "port matched to my intake", what exactly does this mean? And what do you mean a "minor" valve job?
Would porting/putting in bigger valves be the equation of L98 heads?
Thanx again man!

IROC-T

Port matching is when you make the ports on the intake the same size as the ports on the engine,and or plenum etc.,this is also refered to as porting.

I'm not sure but I don't think you can go to much bigger on the valves with a 305cid,because of the bore. There is some room for improvment ,but I think it is minimal. I maybe wrong it just seems I read this some where.

As for minor valve job,he was probably being sarcastic,and has done a multiy angle grind.